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KMID : 0624620110440040262
BMB Reports
2011 Volume.44 No. 4 p.262 ~ p.266
Identification of strain harboring both aac(6')-Ib and aac(6')-Ib-cr variant simultaneously in Escherichia coli and Klebsiella pneumoniae
Kim Yun-Tae

Jang Ji-Hyun
Kim Hyun-Chul
Kim Hyo-Gyeong
Lee Kyoung-Ryul
Park Kyung-Sun
Lee Hee-Joo
Kim Young-Jin
Abstract
The aac(6')-Ib gene is the most prevalent gene that encodes aminoglycoside-modifying enzymes and confers resistance to tobramycin, kanamycin, and amikacin. The aac(6')-Ib-cr variant gene can induce resistance against aminoglycoside and fluoroquinolone simultaneously. Two main methods, sequence analysis and the restriction enzyme method, can detect the aac(6')-Ib-cr variant in clinical strains. We collected the 85 strains that were believed to be aac(6')-Ib positive from clinical isolates. Among them, 38 strains were the wild-type; the remaining 47 strains were the aac(6')-Ib-cr variant. Of these 47 strains, 19 simultaneously harbored aac(6')-Ib and aac(6')-Ib-cr. Our study aims to report the characteristics of the 19 strains that simultaneously harbored both genes. This study is the first investigation published in Korea of strains that included both aac(6')-Ib and aac(6')-Ib-cr variant.
KEYWORD
aac(6')-Ib, aac(6')-Ib-cr, DHPLC, Restriction enzyme, Sequence analysis
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